MySQL PRIMARY KEY Constraint
🔑 MySQL PRIMARY KEY Constraint The PRIMARY KEY constraint in MySQL is used to uniquely identify each row in a table. 👉 It ensures uniqueness and non-NULL values for the key column(s). 1️⃣ What...
Category: MySQL Tutorial
MySQL UNIQUE Constraint
🔐 MySQL UNIQUE Constraint The UNIQUE constraint in MySQL ensures that all values in a column (or a set of columns) are unique. 👉 It prevents duplicate values while still allowing NULL (unlike PRIMARY...
MySQL NOT NULL Constraint
🚫 MySQL NOT NULL Constraint The NOT NULL constraint in MySQL ensures that a column cannot contain NULL values. 👉 It forces users to always provide a value for the column. 1️⃣ What is...
MySQL Constraints
MySQL Constraints In MySQL, constraints are rules applied to columns or tables to enforce data integrity and ensure the accuracy and reliability of data. Types of MySQL Constraints Constraint Description PRIMARY KEY Uniquely identifies...
MySQL ALTER TABLE Statement
MySQL ALTER TABLE Statement The ALTER TABLE statement in MySQL is used to modify the structure of an existing table without deleting its data. 👉 It is one of the most important SQL commands...
MySQL DROP TABLE Statement
🗑️ MySQL DROP TABLE Statement The DROP TABLE statement in MySQL is used to permanently delete a table from a database, including all its data and structure. ⚠️ Irreversible operation — use carefully. 1️⃣...
MySQL CREATE TABLE Statement
MySQL CREATE TABLE Statement The CREATE TABLE statement in MySQL is used to create a new table in a database. Tables are the core structures where data is stored in rows and columns. Syntax...
MySQL DROP DATABASE Statement
🗑️ MySQL DROP DATABASE Statement The DROP DATABASE statement in MySQL is used to permanently delete an existing database along with all its tables, data, views, procedures, and indexes. ⚠️ This action is irreversible....
MySQL CREATE DATABASE Statement
🗄️ MySQL CREATE DATABASE Statement – Complete Tutorial (Beginner → Interview Level) The CREATE DATABASE statement in MySQL is used to create a new database where tables, views, procedures, and data are stored. 1️⃣...
MySQL Operators
MySQL Operators In MySQL, operators are symbols or keywords used to perform operations on values or expressions in queries. Operators are essential for calculations, comparisons, logical operations, and string manipulations. Operators in MySQL can...